Produces some calculations for the factory on strike (5,3)

I believe the answer is:

works out

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'produces some calculations for' is the definition.
I can't tell whether this definition defines the answer.

'factory on strike' is the wordplay.
'factory' becomes 'works' (eg a steel works).
'on strike' becomes 'out' (I've seen this before).
'works'+'out'='WORKS OUT'

'the' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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